JPS6132124B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a roof tile having a water return protrusion on its upper surface, and more specifically, a method for manufacturing a roof tile having a water return protrusion on the upper surface, and more specifically, a method for manufacturing a roof tile having a water return protrusion on the upper surface. The present invention relates to a method of adding a protrusion for returning water.

Generally, tiles are placed on a roof with their front and back ends overlapping each other, as shown in Figure 1. During normal times, rainwater flows down along each tile 1, but during storms, rainwater flows backwards. Since rainwater flows around the back side of the tiles 1 from the overlapping parts of the tiles 1 and causes leakage, it is desirable to form a water return protrusion on the top surface of the tiles 1 to prevent rainwater from flowing back. By the way, roof tiles are usually formed by extrusion molding so that the front-rear direction matches the extrusion direction, so protrusions parallel to the extrusion direction can be easily formed at the same time as extrusion.
It is not easy to form protrusions in the direction perpendicular to the extrusion direction so that they act as water return, and in order to do this, conventionally, the material that will become the protrusions is extruded in a separate process from the extrusion molding process. The method used was to add it to the top surface of the container and harden it using a press or the like. However, with this method, it is necessary to add a forming process for supplying and forming new materials to the tile forming process, which is continuously formed by extrusion molding, which makes the process complicated and inevitably reduces the production speed of tiles. There is a problem in that the advantages of continuous extrusion molding are impaired. For this reason, as disclosed in Japanese Patent Application No. 56-13131, a part of the tiles before hardening is scraped off to a uniform depth, scraped onto the top surface of the tiles, and pressed onto the top surface of the tiles to form protrusions. The applicant has provided a method for forming the cutting edge, but in this case, the tip of the cutting blade 2 is cut in order to increase the cutting depth or to make the cutting surface smooth as shown in Fig. 4. When rounded, there was a problem that cracks were likely to occur in the A part of the figure.

The present invention has been made in view of the above-mentioned points, and its main purpose is to install a projection for water return on a part of a tile in a direction perpendicular to the extrusion direction on a tile production line by extrusion molding. A tile that has protrusions for water return on the top surface that can be easily added to the top surface of the tile by scraping it off, and the top surface of the tile that has been scraped off can be finished smoothly without causing defects such as cracks on the tile. An object of the present invention is to provide a method for manufacturing.

The present invention will be described in detail below based on embodiments shown in the figures. In the method according to the present invention, a tile element body formed by extrusion molding of an inorganic hardening material before hardening and placed on a receiving mold 3 is conveyed together with the receiving mold 3 in one direction, and the tiles at the front end in the feeding direction are conveyed in one direction. The front end of the tile element body 1 is removed by moving the scraping blade 2 diagonally relative to the feeding direction of the tile element body 1 so that the upper part of the front end of the element body 1 is scraped backward by the blade 2 so that the amount of scraping is gradually reduced. The upper part is scraped off, and the scraped off part 4 of the unhardened inorganic hardening material is scraped onto the upper surface of the tile body 1,
This is characterized in that the ridge 5 is pressed onto the upper surface of the tile element body 1 to form a protrusion 5 running in a direction perpendicular to the feeding direction on the upper surface of the tile element body 1. As shown in FIG. 3, the tile body 1 is obtained by cutting a long band 7 formed by continuous extrusion of an inorganic hardening material 6 into appropriate dimensions, As in, band 7
The tile body 1 is then placed on a receiving mold 3 that is conveyed by a conveyor 12. That is, the inorganic hardening material 6 in the hopper 10 is transferred to the conveyor 1 by the forming roll 11.
The strip 7 is formed into a predetermined cross-sectional shape between the receiving mold 3 placed on the mold 2 and the molding die 14, and is extruded forward to form a continuous long strip 7 along the conveyance direction of the conveyor 12. Immediately after forming, the band 7 is cut into appropriate dimensions by a cutter 15 that moves up and down in front of the forming die 14, and is divided into a plurality of tile bodies 1 arranged in the longitudinal direction. Each tile body 1 cut to a predetermined size is placed on a single receiving mold 3 with both front and rear ends facing each other closely, and conveyor 1
2 along one side. In this way, each tile element body 1 is placed on the receiving mold 3 and moves forward.
As shown in FIG. 4, the upper part of the front end is scraped off by the scraping blade 2 disposed in front of the cutter 15, and the scraped part is scraped onto the upper surface of the tile element body 1, and the entire tile element body 1 is scraped off. A protrusion 5 extending over the width is formed. That is, while the tile element body 1 is moved forward, the scraping blade 2 descends and scrapes the material on the upper front end of the tile element body 1 backward, and the scraped material is removed between the scraping blade 2 and the stopper 20. The press 2 lowers between the cutting blade 2 and the stopper 20 while collecting
1 is formed into a predetermined shape on the upper surface of the tile element body 1, and the protrusion 5 extending over the entire width of the tile element body 1 is integrated with the tile element body 1, as shown in FIG. This means that you can get tiles that look great. The lower end of the cutting blade 2 is rounded in order to finish the tile element body 1 smoothly, and as shown in Fig. 4b, the cutting edge is first made to protrude greatly toward the front end surface of the tile element body 1, and then the tile element body 1 is As it moves forward, as shown in c and d of the same figure, it gradually moves upward and the scraping depth becomes smaller, that is, the amount of scraping decreases, and the upper surface of the tile body 1 in front of the protrusion 5 A slope 24 is formed on the surface. On the other hand, the lower surface of the tile body 1 is shaped by the receiving mold 3 into a shape in which both the front and rear ends protrude, and the upper part of the front end is shaved off as shown above, with the amount of scraping being greatest at the front end and moving toward the rear. By gradually reducing the amount of scraping, it has become possible to prevent cracks from forming near the legs 22 formed at the lower front end. In the above embodiment, while conveying the tile element body 1 in the horizontal direction, the scraping blade 2 is moved up and down in synchronization with the feed of the tile element body 1, thereby starting to scrape off the front end of the tile element body 1. Although we have shown an example in which the number of tiles gradually decreases from While conveying the tile blank body 1 together with the receiving die 3 while tilting it with respect to the feeding direction, the scraping blade 2 is moved horizontally relative to the tile blank body 1, and the amount of scraping is gradually reduced. 1
The material may be scraped up from the front end. Compounds A and B having the following compositions were used as the above-mentioned inorganic hardening material, and tiles with smooth cut surfaces and no cracks were obtained.

Mixture A Ordinary Portland cement 10Kg River sand (passed through a 5mm mesh) 30Kg Water 4Kg Mixture B Ordinary Portland cement 10Kg River sand (passed through a 5mm mesh) 27Kg Crushed stone (〃 ) 3Kg Water 4.2 In addition, as the power source for the cutting blade 2, stopper 20, and press 21, an air compressor with a capacity of 5 kg/cm ² is used. It took 0.8 seconds.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the construction state of a normal tile; Fig. 2 is a schematic diagram showing a conventional method for adding protrusions to the upper surface of the tile; and Fig. 3 is an embodiment of the present invention. A schematic process diagram showing an example, FIGS.
The figure is a perspective view showing a roof tile obtained by the present invention, and Figures 6a, b, and c are schematic process diagrams showing the process of forming a protrusion in another embodiment of the present invention, and 1 is a tile body;
2 is a scraping blade, 3 is a receiving die, 4 is a scraped inorganic hardened material, and 5 is a protrusion.

Claims (1)

[Claims] 1 While the tile element formed by extrusion molding of an inorganic hardening material before hardening and placed on a receiving mold is conveyed in one direction together with the receiving mold, the front upper part of the tile element at the front end in the feeding direction is scraped backward. The cutting blade is moved diagonally relative to the feeding direction of the tile body so that the amount of scraping is gradually reduced by the blade, and the upper part of the front end of the tile body is scraped off. A part of the tile element is scraped onto the upper surface of the tile element body and pressed onto the upper surface of the tile element body to form a protrusion running in a direction perpendicular to the feeding direction on the upper surface of the tile element body. A method for manufacturing a roof tile having ridges.